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Agisoft Metashape tutorial (Basic workflow)
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all right so we're going to do a quick
video kind of describing the workflow in
a G soft métis shape here before you
have got a folder where I have some of
the projects I've been working on and
we're going to open up this one here
called neck sitio glyph and as you can
see inside of that folder I've got a
three folder structure one of them that
says photos another one output and the
other one says export and so what you
want to do to get started is take all
your photos of the object for
photogrammetry and dump them into here
so you will likely have raw photos and
JPEGs all in one to go ahead and dump
both of them in here in their photos
folder so now what you want to do is
create an Adi soft project so you can
just open up a G soft and once it's open
you can go ahead and hit file save as go
and find that place where you're going
to save it mine was the next C to a
cliff and you want to save it here in
the output folder so I already have one
saved from before I'm gonna go ahead and
save a different version here alright should
should
here in the top left and we're ready to
get started so the first things first
identify this tab up here called
workflow in the workflow tab when you
click it it has all the things necessary
that you would need in order to put
together a 3d model using photos
including where to start
so we're going to go ahead and click
here at add photos and we're going to
search for that photos folder and we're
gonna have to we're going to want to
take every single photo that you took in
the field so we'll hit ctrl a ctrl a
just allows you to highlight everything
and then hit open and you'll see them
populate in the photos pane in add you
soft so I can see them over here if I
want to inspect my photos within the
software all you have to do is give it a
couple click and then you can use the
mouse scroll to actually zoom in and out
to check different parts of your your
image to see if you have a good photo or
a bad photo another trick is to
right-click your photo and then go to
where it says estimate image quality and
you can actually have the computer
estimate the image quality for all of
your cameras by doing that it'll give
you a value between zero and one and
typically you want something above the
threshold of 0.5 to be a good photo so
just a little tip there to get started
go ahead and close that out hit workflow
align photos this is the first step and
you want to get all these photos aligned
to recalculate that geometry basically
it's going to look for key points and
tie points in every single image trying
to match them to other images so it can
get rolling we're going to leave it in
high and anytime you do an alignment my
advice is just to have it on high
generic pre selection is just fine and
then you could theoretically go ahead
and hit OK with all the default settings
if you ever want to play around with
those you just click here and advanced
open up key point limit and tie point
limit you can change these values around
a little bit and my advice would be to
get on the agile soft meta shape manual
and look up what these things mean and you
you
you will be able to kind of make some
judgment calls as to how you might want
to change those numbers around alright
let's just go ahead and hit OK and I'll
run a photo alignment okay looks like we
finished our photo alignment here and we
have all of our photos aligned if you
just kind of click here in this little
transparent ball you can spin things
around this is kind of a little tumbler
for you to navigate in 3d space the
other control you want to get used to is
the middle mouse button clicking it down
and dragging this is how you pan the
model from side to side zooming is just
scrolling with the mouse scroll and then
of course tumbling right and then the
last thing is if you for some reason the
models like well here and your tumblr
swinging it around like this just double
click the model and it puts it right
there in the center of your tumblr so
you can kind of reset the navigation so
looking at the images it looks like we
have good coverage right in here I took
a few context shots back here but you
can actually see the side of the wall
forming you know it's kind of a zig zag
and this I was very focused on this
glyph that was on a stone here and built
into the side of the wall so this is
typically where you say okay I've got a
successful photo set that has been
aligned and the rest of it is likely to
be a good model so as long as you can
see the general image or the general
shape of the feature that you're trying
to take it's usually a success so the
next step which is actually by the way
if you are trying to get these little
cameras to come up so you can see the
camera positions you toggle this on and
off where it says show cameras and
that's what makes that appear if you're
just getting blue tiles with no image on
the back and you want the images then
you just hit the down arrow click on
show thumbnails and that toggles on the
image to the back of the camera position
so the next step I'm going to turn these
off would be to create a dense cloud
again you go back to your workflow tab
click on dense cloud and you've got a
few choices to make here
I would just leave it on default for now
and run what you have there on low low
is just gonna save a little bit of time
but it will make it will create less
points on the object itself but if you
want to test some out some more dense
clouds you can put in you know medium or
high it's just going to put more points
on the surface of your object that a
little later be interpolated into a mesh
so we're going to hit low and we're
going to go ahead and hit change depth
filtering to aggressive and we're going
to hit okay alright I don't know how
long you waited but a with the magic of
videos and online videos I was able to
kind of have it go right to the dense
cloud here as you can see there's a lot
of points now on the surface and when i
zoom out you can definitely see your
object there is probably some extraneous
points that could be cut away to kind of
improve your model so at this point you
can start making some decisions as to
what you what you actually want to
delete so over here next to the little
arrow icon is your selection tool which
I tend to use the freeform selection and
you drop that down click on freeform and
that way you have a little lasso do that
so you can actually lasso groups of
these points and then just hit the
Delete key and it gets rid of them that
way it doesn't affect your model in any
way so I know I want to get rid of all
these points so I'll get my lasso out of
all of those delete nice looks a little
bit better maybe I don't want the top of
this so I just kind of swing the lasso
around and hit delete and bottom looks
good I'll just leave it the way it is no
the tumblr ball is gone and you may be
trying to move this around and visualize
it differently but there's just a
selection tool and you have to keep in
mind you have to switch back to the
tumblr which is this little arrow here
and now the ball is back in
in there to deselect I get usually what
I do is I just grab a selection tool and
select off the model and it gets rid of
the pink selection and then I go back to
your little arrow okay our next step
here is to go to workflow again and go
to build mesh click on that we're gonna
get another dialog reminiscent of what
just happened there with the dense cloud
and in the dialog it's going to ask you
what you want to interpolate what's the
source data and we're going to choose
dense cloud since that's what we just
created leaving everything there and
default except think a little bit more
about how many polygons you want to
create your model and you'll see what I
mean just a second what what I mean by
faces or polygons for a 3d model I'm
gonna go ahead and choose medium and I'm
going to click OK and it'll it'll skip
to the mesh it looks like we're almost
done there we go got the mesh over here
and new visualization tools up top you
know you have your sparse cloud your
dense cloud tool or visualization and
then you have a mesh visualization that
shows up as a little green triangle when
you click that you'll notice that it has
become solid it's no longer points so
you can zoom in and it looks kind of
distorted what you're looking at is a
colorized mesh or shaded mesh if you
drop this down you can look at it solid
to see what the geometry looks like you
can also look at it as a wireframe and
when you look at the wireframe you see
kind of what I was talking about with
polygons or faces but you have multiple
triangles that are just kind of you know
put together to create the 3d geometry
of the object itself down here in the
bottom left you can see how many faces
are actually making up the object and
here we have 60,000 the higher that
number the more definition you're going
to see in your object but also the
longer it's going to take to compute so
the next step here if we if we were
happy with what we see and we don't want
to edit anymore I'm just going to edit
I'm going to get the freeform tool and
I'm going to kind of straighten up the
bottom here
and hit delete alright we're gonna save
my progress once we're ready to move on
we'll go back to the workflow tab we'll
go to build texture which is our final
step and to be honest with any sort of
object or feature that's fairly you know
good size too small you can just leave
everything on default here and just hit OK
OK
so now what it's going to do is take all
of your photos and find the best photos
for the job to actually wrap and create
a photorealistic texture wrapping the
photos around the 3d object and so it's
going to recalculate and stretch these
images to work around the geometry there
so we'll wait on that alright so your
texture finally finished processing and
now you are looking for it and it's
nowhere to be seen you might have to
actually activate it up here where you
kind of click down the green pyramid
your mesh and you click on the textured
mesh actually showing the texture
wrapped around the mesh so click it
sometimes it'll take a little while to
pop up because it takes it you know for
some reason it's computationally heavy
and takes a little while to actually
visualize there but you know once it's
done hopefully you'll be happy with the
results of what you have there when you
have your photo realistic texture
wrapped around the mesh so you can see
our little Zapotec guy Dixie Joe okay
last step here is to actually export
your model so you can visualize it maybe
in another software or give it off to
another researcher we what you have to
export model click that decide where you
put it remember the three folder
structure put it in the export folder
and we will just call it whatever we
want here I'm going to call it an xhr
cliff and you can choose what kind of 3d
model you want to export typically that
Adobe PDF is fairly shareable between
people the kind of a default or a
standard format to export in would
actually be obj
let's click obj and let's save I had it
already exported so it's just asking if
I want to replace it I'll go ahead and
say yes then we have the dialog that
pops up here what I typically will do is
switch my JPEG texture to PNG texture
everything else I'll leave in default
and just hit OK so now it's exporting
your model and if you open up your
actual folder folder where you have the
three folder structure you go to your
export what you'll find in there are a
set of files now typically I have a few
more files in here because this is
another project I was working on but
typically it'll just be three files
you'll have your obj MTL and whatever
image file you decided to export in and
PNG in this case so if you decided to go
with jpg it'll be a jpg file so at
minimum with this obj you're gonna have
three files obj MTL and whatever the
texture is and later on when you kind of
get more advanced with the texture
dialog you might actually create more
texture files to where you might have to
five ten forty in order to improve
resolution on much larger objects so but
that's basically it from start to finish
using your workflow tab to kind of work
through the different steps in the
workflow in photogrammetry the final
thing I want to mention here is that
between the align phase
in the building your dense cloud to
improve and the calibration in between
your cameras after the alignment you can
go in here to tools click optimize
cameras and just hit OK what that's
going to do is just use the metadata
from all of your photos which is
automatically detected and it's going to
use that to optimize the alignment of
all of your cameras before you move on
with the workflow so I would suggest
making that part of your standard
workflow where you go from your
alignment phase after the initial
alignment and doing a optimize cameras
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